What is Grade A in a bolt?
Bolts are made of different grades of steel. The grade of a bolt determines the maximum amount of stress (tensile strength) that the bolt can handle. Tensile strength is the amount of pull the bolt can withstand before breaking. The method used for tightening the bolt is also dependent upon the grade of the bolt.
What is a Class 2A bolt?
Class 1A is a loose commercial fit for easy assembly and disassembly. Class 2A is a medium fit. Class 3A is a tight fit used where a closed fit between mating parts is required.
What grade is a bolt with 6 markings?
grade 8
A grade 8 bolt will have 6 radial lines on its head. Metric bolts are a bit more straight forward, usually having their strength class number stamped right on the bolt head. Some metric nuts also have the strength class number stamped on their face.
How strong is a Grade 2 bolt?
60,000 to 74,000 psi
Grade 2 hex head bolts are made from low to medium strength carbon steel and offer a tensile strength of 60,000 to 74,000 psi, depending on the diameter.
Is there a Grade 6 bolt?
Available grades run from 2 to 8, with 8 the strongest. Higher grade numbers almost always mean increased strength (an exception is that some grade 6 bolts were stronger than grade 7).
What is a Class 2 thread?
Classes 2A and 2B offer optimum thread fit that balances fastener performance, manufacturing, economy, and convenience. Nearly 90% of all commercial and industrial fasteners use this class of thread fit. Classes 3A and 3B are suited for close tolerance fasteners.
What is a Class 2 screw?
ASTM A193 Grade B8MN Class 2 is a standard material specification for high strength 316N stainless steel fasteners such as bolts, screws, studs, threaded rods and other externally threaded parts, for use in high tensile, high temperature and special purpose applications such as pressure piping & pressure vessels …
What are Grade 2 bolts used for?
Grade 2 hex head bolts are made from low to medium strength carbon steel and offer a tensile strength of 60,000 to 74,000 psi, depending on the diameter. Contractors, designers, OEMs and maintenance staff turn to grade 2 steel fasteners for non-critical joints and applications, mainly because of affordability.
Is grade A the same as Grade 2?
A2. A type of the most common stainless steel grade. It is comparable in strength to grade 2 materials, yet slightly weaker and easy to weld.